Publication detail

Cellulose ethers as water-retaining agents in natural hydraulic lime mortars

VYŠVAŘIL, M. BAYER, P.

Original Title

Cellulose ethers as water-retaining agents in natural hydraulic lime mortars

Type

conference paper

Language

English

Original Abstract

Cellulose ethers (CEs) are commonly used as viscosity enhancing, water retaining agents in cement-based mortars. Nevertheless, studies about the effect of CEs on the properties of natural hydraulic lime-based mortars (NHL) are absent, although the use of mortars with hydraulic lime is often preferred for renovation purposes. In this study, the behavior of NHL mortars modified by four different CEs is assessed. The fresh state of mortars was characterized by water retention, air content, density a consistency. Hardened mortars were submitted to strength determination, study of pore size distribution, and thermogravimetric analyses. Transport of liquid water in the studied materials was characterized by water absorption coefficient, sorptivity, and liquid water diffusivity. Durability of the prepared mortars was monitored by frost-resistance tests. The results revealed elevated air content and water retention in mortars with increasing dose of CEs resulting in decreased density of fresh mortars. The strengths of modified mortars surpassed the reference ones at age of 180 d despite the fact that the mortars showed higher open porosity and water absorption. Enhanced porosity of mortars resulted in improvement of their frost resistance and faster carbonation. From a practical and economical point of view, the CEs dosage of 0.5% by weight of the binder appears to be sufficient.

Keywords

Natural hydraulic lime; cellulose ethers; water retention; air content; porosity

Authors

VYŠVAŘIL, M.; BAYER, P.

Released

19. 12. 2019

Publisher

VGTU Press

Location

Vilnius, Lithuania

ISBN

978-609-476-197-3

Book

MODERN BUILDING MATERIALS, STRUCTURES AND TECHNIQUES 2019

Pages from

194

Pages to

200

Pages count

7

URL

http://webu3.vgtu.lt/uni/stf/mbmst/194-200_MBMST_014.pdf

BibTex

@inproceedings{BUT160933,
  author="Martin {Vyšvařil} and Patrik {Bayer}",
  title="Cellulose ethers as water-retaining agents in natural hydraulic lime mortars",
  booktitle="MODERN BUILDING MATERIALS, STRUCTURES AND TECHNIQUES 2019",
  year="2019",
  pages="194--200",
  publisher="VGTU Press",
  address="Vilnius, Lithuania",
  doi="10.3846/mbmst.2019.014",
  isbn="978-609-476-197-3",
  url="http://webu3.vgtu.lt/uni/stf/mbmst/194-200_MBMST_014.pdf"
}